package com.example.bijidemo.config;

import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.List;

@Slf4j
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
//    开始设置静态资源的映射

    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        log.info("开始静态资源的映射");
        registry.addResourceHandler("/backend/**").addResourceLocations("classpath:/backend/");

    }

    //扩展mvc消息转换器
    @Override
    protected void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        log.info("扩展消息转换器");
        //创建消息转换器对象
        MappingJackson2HttpMessageConverter messageConverter=new MappingJackson2HttpMessageConverter();
  //设置对象转换器 底层把java 对象转换为json
        messageConverter.setObjectMapper(new JacksonObjectMapper());
        //把自己的消息转换器添加到mvc集合中
        converters.add(0,messageConverter);
    }

}
